I'm 18. I think I might be developing parkinsons? My right leg sometimes trembles, cramps and feels weak. Hot flashes. Losing sense of smell; hyposmia

Parkinsons. Andrea, have you been evaluated by a neurologist? That is your first step.
Interesting. You are too young for parkinson's disease, but your focal problems with the right leg need to be examined by a physician. A blood panel may reveal nutritional or hormonal problems that can be treated to help the hot flashes and your anxiety. Develop a trusting relationship with a compassionate physician for your peace of mind. Good luck.